Hi - The answer is 40 grms - apparently they have not changed in weight or size since they were first sold. Maybe it is just me but they look smaller now than they did when they first came out!!! Good luck with the quiz and thanks for supporting the Festival
I don't know the answer but I often wonder if the question of size is an illusion. When I was about 5 Wagon Wheels were huge biscuits which required two hands to hold. When I came across them 30 years later they looked tiny.